I forgot to mention that the Hi-Vi tweeters I have are pretty old and not current production. They look similar to, but are not identical to the Parts Express tweeter marketed under their own name.
The Vifa dome is smoother but less detailed. The planar tweeters seem a bit bright and probably need to be padded down a bit. This is not going to be a plug in and play proposition. The good news is I haven't fried any of them ... yet. Unlike the ribbons Bill tried, these can play loud.